The famous writer, J. Krishnamurti, gives us an honest insight into the concepts of freedom and discipline. So, according to him, respecting elders is not to be confused with blind obedience. On the contrary, respecting elders is very much essential. Respecting and obeying elders is the usual tradition of our society. We are usually instructed never to question them, and sometimes to follow the same, which is said to be very helpful to us. However, obedience and blind obedience both have different meanings. Obedience is when individuals will have their ethics in their thoughts and check whether the elders' advice meets our views on the topic, and blind obedience is slavery, not freedom. Hence, one can never achieve true freedom through blind obedience, and it does more harm than good.
A compound (A) with molecular formula $C_4H_9I$ which is a primary alkyl halide, reacts with alcoholic KOH to give compound (B). Compound (B) reacts with HI to give (C) which is an isomer of (A). When (A) reacts with Na metal in the presence of dry ether, it gives a compound (D), C8H18, which is different from the compound formed when n-butyl iodide reacts with sodium. Write the structures of A, (B), (C) and (D) when (A) reacts with alcoholic KOH.